GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Opine , v. t. & i. [imp. & p. p. Opined ; p. pr. & vb. n. Opining.] [L. opinari, p. p. opinatus; akin to opinus (in comp.) thinking, and perh. to E. apt: cf. F. opiner.] To have an opinion; to judge; to think; to suppose.
   South.
   
   1913 Webster